Webster's English Dictionary

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mastery

mas.tery \'mas-t(*-)re-\ n [ME maistrie, fr. OF, fr. maistre master] 1a: 
   MASTERSHIP, DOMINION  1b: SUPERIORITY, ASCENDANCY  2a: possession or 
   display of great skill or technique  2b: skill or knowledge that makes one 
   master of a subject : COMMAND